Cooked food gives more than eating one of the raw pieces. Eating all raw may give more than the cooked food. BUT you can stack multiple cooked food for better stats than raw.

Cooked Deer, carrot, and blueberry may give more than one deer stew. BUT if I ate deer stew, carrot soup, AND boar jerky, that is WAYYYY more than just 3 raw foods.

Late game you want this big buff from cooked foods, as the raw stuff just doesnt scale well.